<template>
  <div class="tags-nav">
    <ul style="margin-left: -35px">
      <li class="tags-li"
          v-for="(item,index) in tagsList"
          :class="{'active': isActive(item.path)}"
          :key="index">
        <router-link :to="item.path"
                     class="tags-li-title">{{ item.title }}
        </router-link>
        <span v-if="item.name !== 'welcome'"
              class="tags-li-icon"
              @click="closeTags(index)">
          <i class="el-icon-close"></i>
        </span>
      </li>
    </ul>
    <div class="tags-close-box">
      <el-dropdown @command="handleTags">
        <el-button size="mini"
                   type="primary">
          标签选项
          <i class="el-icon-arrow-down el-icon--right"></i>
        </el-button>
        <template #dropdown>
          <el-dropdown-menu size="small">
            <el-dropdown-item command="other">关闭其他</el-dropdown-item>
            <el-dropdown-item command="all">关闭所有</el-dropdown-item>
          </el-dropdown-menu>
        </template>
      </el-dropdown>
    </div>
  </div>
</template>

<script>
export default {
  computed: {
    tagsList () {
      return this.$store.state.tagsList
    },
    showTags () {
      return this.tagsList.length > 0
    }
  },
  methods: {
    isActive (path) {
      return path === this.$route.fullPath
    },
    // 关闭单个标签
    closeTags (index) {
      const delItem = this.tagsList[index]
      this.$store.commit('delTagsItem', { index })
      const item = this.tagsList[index]
        ? this.tagsList[index]
        : this.tagsList[index - 1]
      if (item) {
        delItem.path === this.$route.fullPath &&
        this.$router.push(item.path)
      } else {
        this.$router.push('/welcome')
      }
    },
    // 关闭全部标签
    closeAll () {
      this.$store.commit('clearTags')
      this.$router.push('/welcome')
    },
    // 关闭其他标签
    closeOther () {
      const curItem = this.tagsList.filter(item => {
        return item.path === this.$route.fullPath
      })
      if (curItem.path !== 'welcome') {
        curItem.push({
          name: 'welcome',
          title: '欢迎页',
          path: '/welcome'
        })
      }
      this.$store.commit('closeTagsOther', curItem)
    },
    // 设置标签
    setTags (route) {
      const isExist = this.tagsList.some(item => {
        return item.path === route.fullPath
      })
      if (!isExist) {
        if (this.tagsList.length >= 8) {
          this.$store.commit('delTagsItem', { index: 0 })
        }
        this.$store.commit('setTagsItem', {
          name: route.name,
          title: route.meta.title,
          path: route.fullPath
        })
      }
    },
    handleTags (command) {
      command === 'other' ? this.closeOther() : this.closeAll()
    }
  },
  watch: {
    $route (newValue) {
      this.setTags(newValue)
    }
  },
  created () {
    this.setTags(this.$route)
    // 关闭当前页面的标签页
    // this.$store.commit("closeCurrentTag", {
    //     $router: this.$router,
    //     $route: this.$route
    // });
  }
}
</script>

<style scoped>
.tags {
  position: relative;
  height: 30px;
  overflow: hidden;
  background: #fff;
  padding-right: 120px;
  /* box-shadow: 0 5px 10px #ddd; */
}

.tags ul {
  box-sizing: border-box;
  width: 100%;
  height: 100%;
}

.tags-li {
  float: left;
  margin: -15px 5px 2px 0px;
  border-radius: 3px;
  font-size: 16px;
  overflow: hidden;
  cursor: pointer;
  height: 36px;
  line-height: 40px;
  border: 1px solid #e9eaec;
  background: #fff;
  padding: 0 5px 0 12px;
  vertical-align: middle;
  color: #666;
  -webkit-transition: all 0.3s ease-in;
  -moz-transition: all 0.3s ease-in;
  transition: all 0.3s ease-in;
  text-decoration: none;
}

.tags-li:not(.active):hover {
  background: #f8f8f8;
}

.tags-li.active {
  color: #579FF8;
}

.tags-li-title {
  float: left;
  max-width: 80px;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
  margin-right: 5px;
  color: #666;
  text-decoration: none;
}

.tags-li.active .tags-li-title {
  color: #579FF8;
}

.tags-close-box, .el-dropdown, .el-button {
  height: 40px;
}

.tags-close-box {
  position: absolute;
  right: 0;
  top: 64px;
  text-align: center;
}
</style>
